W32/Forbot-DH is an IRC backdoor and network worm for the Windows platform.
Once installed, W32/Forbot-DH connects to a preconfigured IRC server and joins a channel from which an attacker can issue further commands. These commands can cause the infected machine to perform any of the following actions:
start an HTTP server
start an FTP server
portscan randomly-chosen IP addresses
execute arbitrary commands
steal information such as passwords and product keys
upload/download files
The worm can spread to unpatched computers affected by the LSASS vulnerability (see MS04-011), through backdoors left open by the Troj/Optix family of Trojans and to poorly protected network shares.
W32/Forbot-DH is an IRC backdoor and network worm for the Windows platform.
In order to run automatically when Windows starts up the worm moves itself to the Windows system folder as scvvhost.exe and creates the following registry entries:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Windows Update
scvvhost.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Microsoft Windows Update
scvvhost.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Windows Update
scvvhost.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Windows Update
scvvhost.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Microsoft Windows Update
scvvhost.exe
W32/Forbot-DH also creates its own service named "Microsoft Update", with the display name "Microsoft Windows Update".